Roll src/third_party/pdfium 42424bf2eab6..f20959283711 (3 commits)

https://pdfium.googlesource.com/pdfium.git/+log/42424bf2eab6..f20959283711

git log 42424bf2eab6..f20959283711 --date=short --no-merges --format='%ad %ae %s'
2019-08-13 thestig@chromium.org Remove some checks that are always/never true in CPWL_ListCtrl.
2019-08-13 thestig@chromium.org Reuse existing methods in CPWL_ListCtrl.
2019-08-13 thestig@chromium.org Clean up some CPDF_CMap code.

Created with:
  gclient setdep -r src/third_party/pdfium@f20959283711

The AutoRoll server is located here: https://autoroll.skia.org/r/pdfium-autoroll

Documentation for the AutoRoller is here:
https://skia.googlesource.com/buildbot/+/master/autoroll/README.md

If the roll is causing failures, please contact the current sheriff, who should
be CC'd on the roll, and stop the roller if necessary.


TBR=pdfium-deps-rolls@chromium.org

Bug: None
Change-Id: I5b197c597f0d7265d794dac6bf4f61483f4b6766
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1753047Reviewed-by: chromium-autoroll <chromium-autoroll@skia-public.iam.gserviceaccount.com>
Commit-Queue: chromium-autoroll <chromium-autoroll@skia-public.iam.gserviceaccount.com>
Cr-Commit-Position: refs/heads/master@{#686641}

DEPS

@@ -165,7 +165,7 @@ vars = {
   # Three lines of non-changing comments so that
   # the commit queue can handle CLs rolling PDFium
   # and whatever else without interference from each other.
-  'pdfium_revision': '42424bf2eab6c676036939a1503defde66e0a4eb',
+  'pdfium_revision': 'f2095928371177683ee4e1a746f43633a43c303e',
   # Three lines of non-changing comments so that
   # the commit queue can handle CLs rolling BoringSSL
   # and whatever else without interference from each other.